// StringManip.d

module StringManip;

​

import std.range : empty, popFront, front;

​

​

auto destr(Arg0, Args...)(ref Arg0 arg0, ref Args args) 

{

    return DestrInstance!(Arg0, Args.length+1)(arg0, args);

}

​

​

private struct DestrInstance(T, size_t N)

{

    this(Args...)(ref T arg0, ref Args args)

    {

        items[0] = &arg0;

        foreach(i, ref arg; args) {

            items[i+1] = &arg;

        }

    }

​

    // overloading assignment operator

    void opAssign(rhs_t)(rhs_t rhs)

    {

        for (size_t i = 0; !rhs.empty && i < N; rhs.popFront(), ++i) {

            *items[i] = rhs.front;

        }

    }

​

    T* [N] items;

}

​

​

nothrow unittest {

    string a, b, c;

    destr(a,b,c) = ["foo1","foo2","foo3","foo4"];

    assert([a,b,c] == ["foo1", "foo2", "foo3"]);

​

    destr(a,b,c) = ["bar1","bar2"];

    assert([a,b,c] == ["bar1", "bar2", "foo3"]);

}

​

​

/////////////////////////////////////////////////////

// main.d

void main()

{

    import std.stdio : writeln;

    string a, b, c;

    destr(a,b,c) = ["foo1","foo2","foo3","foo4"];

    writeln([a,b,c]);

​

    destr(a,b,c) = ["bar1","bar2"];

    writeln([a,b,c]);

}